Abstract
Spin-wave (magnon) scattering, when clearly observed by Raman spectroscopy, can be simple and powerful for studying magnetic phase transitions. In this paper, we present how to observe magnon scattering clearly by Raman spectroscopy, then apply the Raman method to study spin-ordering and spin-reorientation transitions of hexagonal manganite single crystal and thin films and compare directly with the results of magnetization measurements. Our results show that by choosing strong resonance condition and appropriate polarization configuration, magnon scattering can be clearly observed, and the temperature dependence of magnon scattering can be simple and powerful quantity for investigating spin-ordering as well as spin-reorientation transitions. Especially, the Raman method would be very helpful for investigating the weak spin-reorientation transitions by selectively probing the magnons in the Mn3+ sublattices, while leaving out the strong effects of paramagnetic moments of the rare earth ions.
Highlights
Spin-wave scattering, when clearly observed by Raman spectroscopy, can be simple and powerful for studying magnetic phase transitions
The Raman spectroscopy of hexagonal manganites has been extensively studied, these studies were focused on phonon vibrations and spin-phonon coupling[6,7,8,19,20,26,27,28]
The observation in single crystal further confirms the intrinsic magnon scattering origin of the broad bands in Fig. 1, but not due to surface, interface, or defect-related effects which may be possible in thin film samples
Summary
Spin-wave (magnon) scattering, when clearly observed by Raman spectroscopy, can be simple and powerful for studying magnetic phase transitions. We present how to observe magnon scattering clearly by Raman spectroscopy, apply the Raman method to study spinordering and spin-reorientation transitions of hexagonal manganite single crystal and thin films and compare directly with the results of magnetization measurements. Our results show that by choosing strong resonance condition and appropriate polarization configuration, magnon scattering can be clearly observed, and the temperature dependence of magnon scattering can be simple and powerful quantity for investigating spin-ordering as well as spin-reorientation transitions. We show that, when magnon scattering is clearly observed, temperature dependent Raman study of magnon scattering provides a simple and powerful method for investigating both spin-ordering and spin-reorientation transitions in single crystal as well as thin film samples
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